Int <-> String (Old)

//converter from int to string
string intToString(int n){
    if(n>=0){
        if(n<10){
            return string (string() + char(n+'0'));
        }else{
            return string(intToString(n/10) + char(n%10+'0'));
        }
    }else{
        return "-"+intToString(-n);
    }
}

//converter from string to int
int stringToInt(string str){
    if(str[0]!='-'){
        if(str.length()==1){
            return int(str[0]-'0');
        }else{
            return stringToInt(str.substr(0,str.length()-1))*10 + int(str[str.length()-1]-'0');
        }
    }else{
        return 0-stringToInt(str.substr(1,str.length()-1));
    }
}